.block-footer {
  position: absolute;
  bottom: 0;
  width: 100%;
  height: 36px;
  padding: 0 20px 10px;
  font-size: 20px;
  color: #eee;
}
.footer-left {
  float: left;
}
.footer-right {
  float: right;
}
.footer-main {
  overflow: hidden;
  text-align: center;
}
.footer-main-center {
  display: none;
  width: 300px;
}
.block-footer:hover .footer-main-center {
  display: inline-block;
}